Sewing-machine



(N'o Model.) 2 Sheets-Sheet L.

J. TRIPP.

SEWING MAGHINE;

No. 282,407. Patented July 31, 1883.

N. FEYERS. FMlo-lihmgnphlr. Wnlunginn. n. c

(No Model.) 2 SheetsSheet 2.

J. TRIPP.

SEWING MACHINE.

Patented July 31, 1883 WITNESSES:

45 nection and the feed-lever D of peculiar construction, its periphery being UNITED- STATES PATENT OFFICE. f

JAMES TRIPP, OFNEW YORK, N. Y., ,ASSIGNOB TO CHARLES r. BEOKWITH TAND ELLEN F. BEOKWITH, corn or OBERLIN, oruo- SEWING-MACHINE.

srnornrcArro v forming part of iletterjs Patent No. 282,407, dated July 31, 1883.

Application filed November 9, 1882. (No model.) i

To all whom it may concern:

Be it known that I, J AMES TRIPP, a citizen of the United States, residing at New York city, in the county of New York and State of 5 New York, have invented new and useful Improvements in Sewing-Machines, of which the following is a specification.

My invention relates to improvements in the feed mechanism of sewing-machines and parts IO immediately connected therewith, the nature of which will be fully understood by reference to the following specification and the drawings annexed, which form part ofthe same.

Referring to the drawings, Figure 1 is a ver- 1 tical section of a sewing-machine post anda portion of the arm with myimprovements applied thereto. Fig. 2 is a section taken at right angles to Fig. 1. Figs. 3, 4, 5, 6, 7, 8,

, and 9 show details of parts on a larger scale. s In each of the views similar letters of reference are employed to indicate corresponding parts in all the figures.

A represents the bed-plateof the machine;

B, the post of the arm, and C the arm. a

2 D is the feed-lever connection, which, as

shown in Fig. 1, is pivoted ona short axle, d, supported in position in the post B by means. of centering-screws b b. The feed-lever connection D is provided at its lower end with a ball or circular bearing-piece, (1*, of the ordinary construction, adapted to bear in a socket, d, in the end of the feed-lever D while at its upper end it is bent, as shown at D, Fig. 2, and provided with a bearing, d", for the reception of a screw, d ,by means of which a pivoted curved arm orcranefE, is attached to the feed-lever connection D, in such position and of such shape as to-be capable of spanning the main shaftX and the cam F operating the feed-lever connection D1 The pivoted arm or crane E is provided at 6* with a friction pulley or roller, 6, adapted to bear against the surface of the cam F, for the purpose of operating the feed-lever con- The cam F is from the axis of the pivoted arm or crane E,

as shown more clearly by separate views at tion of the feed-lever, and consequently of the feed, may be regulated at will. If the crane E is turned so as to bring the roller 6 toward the end 1 of the cam F, which has the smallest diameter and throw, the stitch will be shortened by reason of the shortening of the feed, while on the other hand, if the crane E is turned so as to bring the roller 6 toward the end2 of the cam F, which has the greatest diameter and throw, the stitch will be lengthened on account of the increase in the extent of :the feed.

The position of the crane E, I and consequently of its friction-roller e, is controlled by means of an inverted-L lever, G, pivoted at g the centerof the post B. The long arm 9 .of

the lever G is adapted to be received withina groove or slot, 6, in the upper surface of the crane E, while its short arm g is received into i and operated by a circular slot, 9*, formed in a thumb-screw, g which by preference is formed with a screw-shank, g, tapped so as to be received into a female screw, 0, formed in the arm 0. By turning the thumb-screw g in one direction the lever G will cause the crane E to move its roller 6 onto the smaller diameter of the cam F, while by turning it in the opposite direction the roller 6 will be broughtover the larger diameter to the extent desired to regulate the extent of feed, and

consequently. the length of stitch.

H is a forked lever, pivoted at [h to the feedlever connection D, and adapted to support a friction-pulley, h, mounted on an axis, if, and adapted to bear against and be operated by a cam, I, by preference formed in one piece with the cam F, and mounted on the main shaft X.

The forked lever H, at its forward end, is

provided with a bearing-piece, H, adapted to rest updn the upper end of a sliding rod or shaft, J, which is supported in a bearing, D, formed on or affixed to the feed-connection D, and a hole or bearing formed in the ball or bearing-piece al through which it passes and rests upon a screw or other suitable bearing,

(1*, formed in the end D of the feed-lever D The object ofthis part of the mechanism being to regulate the rise of the feed, the lowering of the same being effected in the usual manner by means of the feed-spring, its operation is as follows: The cam I, in its revolution, depresses the lever, and there retains it' for the desired time, and in doing so depresses the rod J, and with it the end of the feed-lever.

The rod J is represented in the drawings as resting on a screw-bearing, d, by turning which great delicacy of adjustment may be obtained with facility.

K is the shuttle-lever connection, operated in the usual manner by an eccentric, 7c, mounted on the main shaft X, and by preference formed in one piece with the cams F and I, the object of forming the cams F and I and the eccentric k in one piece beingthat by means of a single screw, by preference passing through the surface of the eccentric 7c and passing into a hole previously prepared in the main shaft X, the whole of the parts may be and are simultaneously and correctly timed.

The limbs 7c of the fork K of the shuttlelever connection K are bored through at k k tapped into the said shanks Z, as shown. The

.or affixed to the end of the shuttle-lever connection K.

The limbs K of the fork of the shuttle-lever connection K, according to my invention, are each bored with a concentric opening or hole, K into each of which is inserted the shank n of a surface-plate, N, one of which is shown separately at Figs. 7 and 8. V

The surface-plates N are, on their outer faces, by preference, formed of case-hardened steel, although any other suitable material may be employed. g

In place of employing a binding-screw to hold the combined eccentric and cams in position on the main or driving shaft, I can, if

desired, employ a slot and key or other suitable retaining means.

Having thus described my invention, what with a feed-connection and a pivoted arm or crane, E, of a lever or arm for controlling the position of the roller or bearingssurfaee of the feed-connection in relation to its operatingcam, substantially as shown and described.

4. In a sewing-machine, the combination, with the feed-lever connection D, pivoted arm or crane E, and the cam F, of the pivoted lever G, substantially as and for the purpose described.

5. In a sewing-machine, the combination, with the feed-lever connection D, pivoted arm or crane E, and cam F, of the pivoted lever G and grooved adjustable thumb-screw substantially as and for the purpose specified.

6. In a sewing-machine, the combination, with a feed-lever connection, of a pivoted arm operated by a cam, and a rod or shaft, J, adapted to operate the feed-lever connection and feed, substantially as shown and described.

7. In a sewing-machine, the combination, with a feed-lever connection, a pivoted arm or crane, and a cam, of a pivoted lever operated by a cam, and a sliding rod or bar adapted to control the rise of the feed, substantially as shown and described.

8. In asewing-machine or similar device, a pivoted plate or plates having surfaces'formed at an angle to the main portions thereof, and adapted to regulate the position of their work ing-surfaces by rotation or partial rotation, substantially as and for the purpose described.

9. The combination, with the main or driving shaft of a sewing-machine and a pivoted arm or crane carrying a roller or bearing-surface, and attached to the feed-lever connection in position to control the motion thereof, of a cam the periphery of which is so formed that the surface is a portion of an arc of a circle larger than one struck from the axis of the pivoted crane or lever, substantially as de; scribed.

In witness whereof I have hereunto set my I hand this 24th day of October, A. D. 1882.

JAMES TRIPP.

-Witnesses:

MAX BAYERSDORFER, WM. E. RICHARDS. 

